Hello!
This is actually less a question than some information, if anyone else
struggles with the same issue.
I am located in the UK and use a Sipura-3000 adapter to connect to a BT
line (via fxo port). One problem I had was that disconnect supervision
didn't work:
Some caller phones me (my adapter)
adapter goes off-hook (answers call)
caller hangs up
adapter doesn't realize and stays off hook.
I researched into it and found that the BT exchange delivers a CPC (0.1
sec) upon the caller's hangup and a disconnect tone about 3 seconds
later. The tone lasts 6 seconds and remains constant during that time. I
recorded the disconnect tone with Cool Edit and did a frequency analysis
on it and got the following components:
400Hz/-56dB +
1200Hz/-69dB +
2000Hz/-65dB +
2800Hz/-59dB +
3600Hz/-59dB
If normalized with -56 dB reference level, I get
400Hz/0dB +
1200Hz/-13dB +
2000Hz/-9dB +
2800Hz/-3dB +
3600Hz/-3dB
I suspect that the harmonics (1200, 2000, 2800, 3600)Hz may not have
come from the Exchange, but were distortions.
After the 6 seconds the tone stopped and there was succession of two
'clicks' on the line (another CPC? haven't looked into that); both
were
0.3 secs apart.
I tried to use both, the CPC and the disconnect tone in the Sipura-3000
settings. Unfortunately I couldn't get disconnect supervision via the
disconnect tone to work. In a post on the voxilla forum
http://voxilla.com/PNphpBB2-viewtopic-t-2904.html
I found some further info on disconnect tone in the UK - unfortunately I
couldn't get those settings to work. I also looked into BT's SIN notes
(on http://www.sinet.bt.com , notes 350, 351) but failed to see further
information on what tone they exactly deliver for a disconnect event.
However, the CPC did work. I set the adapter to a CPC minimum time of
0.05 seconds, and from then on it recognized remote disconnection in
every test phone call. If I set the time too short I got problems - for
incoming calls the adapter started to mistake the incoming ringing for
disconnect events and simply wouldn't go off hook anymore.
Now, these are the settings I configured my adapter with:
Settings:
spa-3000-setup-web-page/PSTN-line-tab/PSTN-disconnect-detection-section:
'Detect CPC' => 'yes'
'Min CPC Duration' => '0.05'
I also have
'Detect Disconnect Tone' => 'no' [as it didn't work]
'Disconnect Tone' => '400@-30,400@-30;5(5/5/1+2)'
'Detect Polarity Reversal' => 'Yes'
'Detect PSTN Long Silence' => 'yes'
'PSTN Long Silence Duration' => '150'
'Detect VoIP Long Silence' => 'no'
'VoIP Long Silence Duration' => '30'
but the relevant values are 'Detect CPC' => 'yes' and
'Min CPC Duration'
=> '0.05'
I hope this helps, if anyone struggles with unrecognized disconnects.
God bless, Peter
CPC: Calling Party Control: A short break in the line current in the
called party's phone line when the calling party hangs up.
(def. from http://www.vikingelectronics.com/glossary/telecom-term.php)
--
dyslexics of the world - untie !
Which firmware version are you using on your spa3000? Peter Hoppe wrote: || Hello! || || This is actually less a question than some information, if anyone else || struggles with the same issue. || || I am located in the UK and use a Sipura-3000 adapter to connect to a BT || line (via fxo port). One problem I had was that disconnect supervision || didn't work: || || Some caller phones me (my adapter) || adapter goes off-hook (answers call) || caller hangs up || adapter doesn't realize and stays off hook. || || I researched into it and found that the BT exchange delivers a CPC (0.1 || sec) upon the caller's hangup and a disconnect tone about 3 seconds || later. The tone lasts 6 seconds and remains constant during that time. || I recorded the disconnect tone with Cool Edit and did a frequency || analysis on it and got the following components: || || 400Hz/-56dB + || 1200Hz/-69dB + || 2000Hz/-65dB + || 2800Hz/-59dB + || 3600Hz/-59dB || || If normalized with -56 dB reference level, I get || || 400Hz/0dB + || 1200Hz/-13dB + || 2000Hz/-9dB + || 2800Hz/-3dB + || 3600Hz/-3dB || || I suspect that the harmonics (1200, 2000, 2800, 3600)Hz may not have || come from the Exchange, but were distortions. || || After the 6 seconds the tone stopped and there was succession of two || 'clicks' on the line (another CPC? haven't looked into that); both were || 0.3 secs apart. || || I tried to use both, the CPC and the disconnect tone in the Sipura-3000 || settings. Unfortunately I couldn't get disconnect supervision via the || disconnect tone to work. In a post on the voxilla forum || || http://voxilla.com/PNphpBB2-viewtopic-t-2904.html || || I found some further info on disconnect tone in the UK - unfortunately || I couldn't get those settings to work. I also looked into BT's SIN || notes (on http://www.sinet.bt.com , notes 350, 351) but failed to see || further information on what tone they exactly deliver for a disconnect || event. || || However, the CPC did work. I set the adapter to a CPC minimum time of || 0.05 seconds, and from then on it recognized remote disconnection in || every test phone call. If I set the time too short I got problems - for || incoming calls the adapter started to mistake the incoming ringing for || disconnect events and simply wouldn't go off hook anymore. || || Now, these are the settings I configured my adapter with: || || Settings: || spa-3000-setup-web-page/PSTN-line-tab/PSTN-disconnect-detection-section: || || 'Detect CPC' => 'yes' || 'Min CPC Duration' => '0.05' || || I also have || 'Detect Disconnect Tone' => 'no' [as it didn't work] || 'Disconnect Tone' => '400@-30,400@-30;5(5/5/1+2)' || 'Detect Polarity Reversal' => 'Yes' || 'Detect PSTN Long Silence' => 'yes' || 'PSTN Long Silence Duration' => '150' || 'Detect VoIP Long Silence' => 'no' || 'VoIP Long Silence Duration' => '30' || || but the relevant values are 'Detect CPC' => 'yes' and 'Min CPC || Duration' => '0.05' || || || I hope this helps, if anyone struggles with unrecognized disconnects. || || God bless, Peter || || || CPC: Calling Party Control: A short break in the line current in the || called party's phone line when the calling party hangs up. || (def. from http://www.vikingelectronics.com/glossary/telecom-term.php) || -- || dyslexics of the world - untie ! || _______________________________________________ || --Bandwidth and Colocation provided by Easynews.com -- || || Asterisk-Users mailing list || To UNSUBSCRIBE or update options visit: || http://lists.digium.com/mailman/listinfo/asterisk-users
Jonathan, many thanks for your reply. The adapter has firmware version 3.1.3(GWa). Does that version have problems with diconnect tones? Would you recommend I should upgrade? Can you give me some reasons or point me to resources (apart from google) where I can research further? What would you say are the risks of upgrading? I am usually a bit anxious about firmware upgrade because I have that fixed idea that EITHER the new firmware may break other features (like - registration problems with SIP provider, connectivity issues and so on) OR there may be some problem during firmware upgrade which damages the device in question. For example, for the Grandstream Budgetone 100 phone, power outage during firmware upgrade from TFTP will damage the device(1). And I can't fix it once it's broken; it's not like a computer where I simply reinstall the OS / put in a new component etc. Once it's gone, it's gone. My fears are probably totally unfounded, but better safe than sorry. So I wouldn't upgrade unless there are good reasons to do so (if it ain't broke, don't fix it). But thanks very much for that hint. I actually have two other adapters, and they may be way out of date: 2.0.13(GWg) - so they may really need updating. Peter -- (1) BudgeTone-100 User Manual, version 1.0.5.11, section 6.1: "Upgrade with TFTP", warning: The device WILL get damaged if there is a power outage during firmware upgrade. Grandstream STRONGLY recommend customer maintain UNINTERRUPTED POWER SUPPLY during firmware upgrade. This damage is NOT covered by the manufacture warranty. Grandstream will NOT take any responsibility for this kind of damage. Please be very CAREFUL when doing firmware upgrade.> Which firmware version are you using on your spa3000? > > Peter Hoppe wrote: > || Hello! > || > || This is actually less a question than some information, if anyone else > || struggles with the same issue. > || > || I am located in the UK and use a Sipura-3000 adapter to connect to a BT > || line (via fxo port). One problem I had was that disconnect supervision > || didn't work: > || > || Some caller phones me (my adapter) > || adapter goes off-hook (answers call) > || caller hangs up > || adapter doesn't realize and stays off hook.-- dyslexics of the world - untie !
I found some more information on UK settings with sipura-3000 on http://www.voip-info.org/wiki/view/Sipura+3000 They point to a document with UK specific settings for spa-3000. This document is at http://www.provu.co.uk/pdf/sipura/sipura_uk_regional_settings.pdf Hope this helps others. These resources handle disconnect settings as well. I'll be trying the disconnect tone settings they suggest. Peter> Jonathan Attwood jmattwood at gmail.com > Tue Dec 27 16:26:59 CST 2005 > > Which firmware version are you using on your spa3000? > >> Peter Hoppe wrote: >> || Hello! >> || >> || This is actually less a question than some information, if anyone else >> || struggles with the same issue. >> || >> || I am located in the UK and use a Sipura-3000 adapter to connect to a BT >> || line (via fxo port). One problem I had was that disconnect supervision >> || didn't work: >> || >> || Some caller phones me (my adapter) >> || adapter goes off-hook (answers call) >> || caller hangs up >> || adapter doesn't realize and stays off hook. > >
Thanks very much! I'll definitely sook at these resources as well if other problems come up. I also found some more info on sipura setup un the UK, see http://lists.digium.com/pipermail/asterisk-users/2005-December/140037.html Thank you very much again for your comments. Good to hear that you had no issues with firmware upgrades. I feel a bit more encouraged about it. God bless, Peter>Peter, > >I'm using the firmware 3.1.5(GWb) and was wondering if your suggestions >would be of any benefit to me. Incidentally, I've never had an issue >upgrading or downgrading the firmware in 2 spa-3000s, I just had to make >sure the unit had only just been powered up when initiating the upgrade. >(YMMV) > >Anyway, if you're wanting somewhere else to read & ask questions have a look >at http://voxilla.com/forum-viewforum-f-14.html for Sipura/Linksys adapters >or http://voxilla.com/PNphpBB2-viewforum-f-17.html for asterisk. Fantastic >resources with helpful & knowledgeable respondents. >